# How many 4-inch by 8-inch bricks are needed to build a walk 6 feet wide and 24 feet long?

(C) 648

Explanation

Width of walk is 6 ft., or $$6 \times 12=72$$ in. Width of each brick is 4 in. Number of bricks that can be fitted along the width is $$72 \div 4 = 18$$.
Length of walk is 24 ft., or $$24 \times 12=288$$in. Length of each brick is 8 in. Number of bricks that can be fitted along the length is $$288 \div 8=36$$
$$18 \times 36 = 648$$